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Javascript Array Basic Question

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May 06.2020

Hi, Im learning JavaScript but have a question about arrays, hope you can help:

I understand what an array/element etc is but can you explain to me the differences between declaring an array like this:

let logEntries = [ ]

or this:

let logEntries

logEntries = [ ]

One we are declaring logEntries as an array at the start in the variable area, and the other we are turning a standalone variable into an array, but what is the difference or best way? Are they any different programmically?

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2 Comments(s) ↴

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@SempervivumMay 07.2020 — From a functional view both versions behave identical. The first one is shorter and simpler and I would recommend to use ist. However there can be a reason to use the second one: If the variable needs to be global but it's value is not known at first and has to be assigned inside a function it can be appropriate to define it in the global first scope and later on assign the value in the limited scope of the function.
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@VITSUSAMay 07.2020 — I agree with Sempervivum, both versions behave identical.
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